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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-06-07 11:11:03 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-06-24 17:45:58 -0300 |
| commit | baf2a265c71113a91f6971313ef191be9e77ef6a (patch) | |
| tree | ad894e8766707e8c10e98b6e4c857ab315fa0276 /nptl | |
| parent | 5b41b2659d35b72636ab50a28d6815cad9c22a66 (diff) | |
| download | glibc-baf2a265c71113a91f6971313ef191be9e77ef6a.zip glibc-baf2a265c71113a91f6971313ef191be9e77ef6a.tar.gz glibc-baf2a265c71113a91f6971313ef191be9e77ef6a.tar.bz2 | |
misc: Optimize internal usage of __libc_single_threaded
By adding an internal alias to avoid the GOT indirection.
On some architecture, __libc_single_thread may be accessed through
copy relocations and thus it requires to update also the copies
default copy.
This is done by adding a new internal macro,
libc_hidden_data_{proto,def}, which has an addition argument that
specifies the alias name (instead of default __GI_ one).
Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: Fangrui Song <maskray@google.com>
Diffstat (limited to 'nptl')
| -rw-r--r-- | nptl/pthread_create.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index e7a099a..a06d611 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -624,9 +624,12 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr, /* Avoid a data race in the multi-threaded case, and call the deferred initialization only once. */ - if (__libc_single_threaded) + if (__libc_single_threaded_internal) { late_init (); + __libc_single_threaded_internal = 0; + /* __libc_single_threaded can be accessed through copy relocations, so + it requires to update the external copy. */ __libc_single_threaded = 0; } |